Federal prosecutors want Mitchell Stein, the ex-CEO of Signalife and Heart Tronics convicted on charges of running a 5-year fraud scheme with alleged co-conspirator and NFL great Willie Gault, to cough up $5.4 million in ill-gotten gains. Mitchell Stein, the ex-CEO of Signalife (later Heart Tronics), was convicted in May on 14 charges that he masterminded a 5-year fraud scheme to pump up the heart monitoring device company's share price. Now federal prosecutors want him to cough up not only his ill-gotten gains, but the loot taken by his ex-chauffeur co-conspirator.